11 Guildhall Square Carmarthen SA31 1QBBrand: Nationwide Nationwide Building Society 11 Guildhall Square | Current account, Mortgage, Savings and other personal finance in CarmarthenVisit your local Nationwide Building Society at 11 Guildhall Square in Carmarthen. The world's largest building society, run for the benefit of its members. Helping you with your Current account, Mortgage, Savings.Return to Nav Find your nearest branch Here today, here tomorrow How can we help? Phone: Tel: 0345 266 0485 0345 266 0485 Address: 11 Guildhall Square Carmarthen SA31 1QB GB Get directions Day of the Week Hours Monday 9.00am - 4.30pm Tuesday 9.00am - https://locations.nationwidebranches.co.uk/carmarthen/11-guildhall-square